The paper details an attempt to measure the amount and distribution of the heat radiated from electric fires, employing the “Leeds” method already largely used for gas fires. A number of types of fire were tested, the radiant efficiency as measured lying generally within the limits of 55–70 per cent, with an average of about 60 per cent. The results are fairly reliable for comparative purposes, and the error in the radiant efficiency determination is probably well within 5 per cent.